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Spatial distribution and longitudinal variation of clay minerals in the Central Indian Basin

DRS at CSIR-National Institute of Oceanography

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Title Spatial distribution and longitudinal variation of clay minerals in the Central Indian Basin
 
Creator Valsangkar, A.
 
Subject clay minerals
geographical distribution
fracture zones
spatial variations
 
Description Grain size and clay mineral distribution up to 45 cm depth in the silty clay sediments from 26 box cores from 10 degrees to 16 degrees S along four longitudes (73.5 degrees-76.5 degrees E) were studied for understanding spatial variability in the Central Indian Basin (CIB). The average sand content in the basin is 3.8%, which decreases systematically and longitudinally to 0.3% towards south. The average illite and chlorite major clay mineral abundance also decrease southwards along the four longitudes from 10 degrees S, and show the limit of influence of the Ganges-Brahmaputra river's supply up to 10 degrees S. However, the average clay content increases from west to east in the basin, and southwards along 73.5 degrees E and either side of the 76.5 degrees E fracture zone (FZ), which strongly suggests the possibility of clay supply due to circulation of Antarctic Bottom Water from the south through the FZ. The distribution of four clay minerals along 73 degrees and 76.5 degrees E FZ in the CIB shows dissimilar trends of increase and decrease, and indicate a mix environment. The FZ in the CIB therefore has an important role in controlling the distribution of clay minerals.
 
Date 2011-09-19T10:26:05Z
2011-09-19T10:26:05Z
2011
 
Type Journal Article
 
Identifier Acta Geologica Sinica, vol.85; 2011; 814-825
http://drs.nio.org/drs/handle/2264/3920
 
Language en
 
Rights An edited version of this paper was published by Springer/Geological Society of China. This paper is for R & D purpose and Copyright [2011] Springer.
 
Publisher Geological Society of China